Connection possibilities of PC-1475

Index

• Connecting to IBM-PC
• Advanced Serial Cable
• Connection to Another Pocket Computer
• Connection to a Modem
• Serial Driver for 4800 Baud

Connection to a PC over the serial interface (9 lines!)

Attention! Construction only for experienced people! No warranty or guaranty for mistakes on this page!

Pocket Computer 15 pin IO	-	big PC 9 pin IO
2	-	2
3*	-	3*
7	-	5
11	-	1+8
plug for PC-1475		plug for PC

(*): voltage is parted! The voltage parter consists of two 1 kOhm resistors, which reduces the 12V from a PC to pocket-friendly 6V! If you use a laptop you shouldn't use the resistors or make a switch between GND and the connected resistor to cut it off.
Don't use it for mouse or modem connections, it won't work!

(PC out 3)--[diode->|-]--[1 kOhm]--(Pocket in 3)--[1 kOhm]--Ground

* here to solder!

Pocket line 5 must be connected to 10 or 13!

Advanced serial cable

C1 - C4	10µF 25V
C5 + C6	0,1µF
IC1	CMOS 4069 (14 Pin)
IC2	HIN232A oder MAX232 (16 Pin)
IC3	Voltage regulator 5V L7805CV or similar
*	The diode (N4841) prevents the pocket computer from discharging when no battery is connected

This cable works with mouses, modems, laptops and many more serial devices, too!

Connection to another Pocket Computer

over 2 lines:

PC 1 15 pin IO	-	PC 2 15 pin IO
2+3	-	2+3
7	-	7

Pocket line 5 must be connected to 10 or 13 at both Pocket Computers!
(The numbers of the lines of the interface are counted from the contrast wheel!)

over a full cable:

PC 1 15 pin IO	-	PC 2 15 pin IO
2	-	3
3	-	2
4	-	8
5	-	11
7	-	7
8	-	4
11	-	5

Connection to a serial modem (9 line connector!)

Pocket Computer 15 pin IO	-	modem
2	-	3
3*	-	2*
4	-	7
5*	-	6+8*
7	-	5
8*	-	1*
14	-	4

(*): voltage is parted!
Use the advanced cable for this!

Commands for a standard modem:
Initialization:

AT&F&C1&D2 + CR

Dialing:

ATDT + phone number + CR

End a call:

~~~+++~~~ATH0 + CR

You'll need a serial cable, either simple or good. The driver uses the same pins like the internal with 1200 baud.
Download: SIO driver

Installation

• Unzip the driver and connect pocket computer to your PC.
• Enter on your pocket computer:
• NEW
• POKE &FFD7,0,136 (using 32kB RAM card)
  POKE &FFD7,0,&E4 (8kB)
  POKE &FFD7,0,&C4 (16kB)
• NEW
• OPEN
• LOAD
• Big PC:
• Start PocketAsm
• Load sio1360.bas (compatible to 1475!)
• Press F11 and select 1200 baud:
  
• F4 to send the program
• BREAK when finished
• RUN
• The driver is now installed!

Usage

Setup PocketAsm to 4800 baud and ignore line endcode:

How to send data to PC

In PocketAsm click receive file and enter a name.

• Transmit single byte: POKE 32899,byte: CALL 32905 or CALL 32900,char (replace byte with a number and char with a printable character)
• Transmit BASIC program: CALL 32915
• Transmit Variablen: CALL 32925

The pocket will show the prompt ">" when finished. PocketAsm: Press ESC.

Transfer back to pocket computer

• Transmit single byte: CALL 32910 (PEEK 32899 holds the byte)
• Transmit BASIC program: CALL 32920
• Transmit variables: CALL 32930

PocketAsm: Click send file and select file. Pocket: Will show prompt ">" when finished.

Edit program on big PC and send it back

Start PocketAsm

• Open received file
• Answer the question BASIC? with yes
• Select model PC-1475
• Your program is ready for editing
• To save it: Select transdrive format!
• Open saved file with hex edit and delete first 17 bytes.
• Send this file back to pocket computer using send file in PocketAsm